LIP in medicine may refer to serum lipase or lymphocytic interstitial pneumonia. 1. LIP may refer to serum lipase, which is elevated in the clinical sense, mainly for the diagnosis of acute pancreatitis, although elevated values can also be seen in certain diseases (e.g., perforated peptic ulcer, intestinal obstruction, acute cholecystitis, cirrhosis, hepatitis, etc.). 2. LIP can be the abbreviation of lymphocytic interstitial pneumonia, the full name is lymphocytic interstitial pneumonia, lymphocytic interstitial pneumonia is a kind of chronic, progressive interstitial pneumonia, most of which is accompanied by AIDS, and the clinical manifestations of the patients are cough, dyspnea, weight loss, fever and fatigue, chest pain, hemoptysis and so on. It is recommended to go to the hospital for further counseling.